Gabriele Cosmo
168 lines
5.4 KiB
C++
168 lines
5.4 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4IonCoulombCrossSection.hh
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//-------------------------------------------------------------------
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//
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// GEANT4 Class header file
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//
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// File name: G4IonCoulombCrossSection
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//
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// Author: Cristina Consolandi
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//
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// Creation date: 05.10.2010 from G4eCoulombScatteringModel
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//
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// Class Description:
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// Computation of Screen-Coulomb Cross Section
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// for protons, alpha and heavy Ions
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//
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//
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// Reference:
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// M.J. Boschini et al. "Nuclear and Non-Ionizing Energy-Loss
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// for Coulomb Scattered Particles from Low Energy up to Relativistic
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// Regime in Space Radiation Environment"
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// Accepted for publication in the Proceedings of the ICATPP Conference
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// on Cosmic Rays for Particle and Astroparticle Physics, Villa Olmo, 7-8
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// October, 2010, to be published by World Scientific (Singapore).
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//
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// Available for downloading at:
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// http://arxiv.org/abs/1011.4822
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//
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// -------------------------------------------------------------------
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//
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#ifndef G4IonCoulombCrossSection_h
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#define G4IonCoulombCrossSection_h 1
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#include <CLHEP/Units/SystemOfUnits.h>
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#include "globals.hh"
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#include "G4NistManager.hh"
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#include "G4ParticleDefinition.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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class G4IonCoulombCrossSection
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{
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public:
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explicit G4IonCoulombCrossSection();
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~G4IonCoulombCrossSection() = default;
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void Initialise(const G4ParticleDefinition*, G4double cosThetaLim);
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G4double NuclearCrossSection();
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G4double SampleCosineTheta();
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void SetupKinematic(G4double kinEnergy, G4double tmass);
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void SetupTarget(G4double Z, G4double kinEnergy, G4int heavycorr);
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inline void SetupParticle(const G4ParticleDefinition*);
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inline G4double GetMomentum2();
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G4IonCoulombCrossSection & operator=
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(const G4IonCoulombCrossSection &right) = delete;
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G4IonCoulombCrossSection(const G4IonCoulombCrossSection&) = delete;
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private:
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void SetScreenRSquare(G4int iz);
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const G4ParticleDefinition* theProton;
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G4NistManager* fNistManager;
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G4Pow* fG4pow;
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G4double coeff;
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//cost - min - max
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G4double cosThetaMin;// def 1.0
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G4double cosThetaMax;// def -1.0
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//SetupTarget
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G4double cosTetMinNuc;// -->cosThetaMin
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G4double cosTetMaxNuc;// -->cosThetaMax
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//cross section
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G4double nucXSection;
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//energy
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G4double etag;
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// projectile........................
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const G4ParticleDefinition* particle;
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G4double chargeSquare;
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G4double spin;
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G4double mass;
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//lab of incedent particle
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G4double tkinLab;
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G4double momLab2;
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G4double invbetaLab2;
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//relative system with nucleus
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G4double tkin;
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G4double mom2;
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G4double invbeta2;
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// target nucleus
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G4double targetZ;
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G4double targetMass;
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G4double screenZ;
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G4double alpha2;
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G4double ScreenRSquare;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline
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void G4IonCoulombCrossSection::SetupParticle(const G4ParticleDefinition* p)
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{
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particle = p;
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mass = particle->GetPDGMass();
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spin = particle->GetPDGSpin();
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if(0.0 != spin) { spin = 0.5; }
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G4double q = particle->GetPDGCharge()/CLHEP::eplus;
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chargeSquare = q*q;
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tkin = 0.0;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4IonCoulombCrossSection::GetMomentum2()
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{
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return mom2;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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